title: Structure elucidation and NMR assignments of two new triterpenoids from the stems of Paragonia pyramidata (Bignoniaceae).
abstract: Phytochemical investigation of dichloromethane (DCM) extract from the stems of Paragonia pyramidata var. pyramidata L. Rich. (Bur.) resulted in the isolation and characterization of two new triterpenoids 3β,19β-dihydroxylup-12, 20(29)-diene-28-oic acid (1) and 3β,19β-dihydroxylup-12-en-28-oic acid (2), three known triterpenoids lupeol (3), spinosic acid A (4) and oleanolic acid (5), together with four known steroids (20R)-22E-24-ethylcholesta-4,22-dien-3-one (6), (20R)-24-ethylcholest-4-en-3-one (7), stigmasterol (8) and β-sitosterol (9). HREIMS, GC-MS and NMR experiments including HSQC, HMBC, COSY and NOESY were used for the determination of the structures and NMR spectral assignments. This is the first report about the chemical constituents for this plant.
authors.forename: Xiao-Ling
authors.initials: XL
authors.lastname: Wang
authors.forename: Anne-Emmanuelle
authors.initials: AE
authors.lastname: Hay
authors.forename: An
authors.initials: A
authors.lastname: Matheeussen
authors.forename: Mahabir P
authors.initials: MP
authors.lastname: Gupta
authors.forename: Kurt
authors.initials: K
authors.lastname: Hostettmann
mesh_terms: D029402:Bignoniaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000592:standards; D015394:Molecular Structure; D018547:Plant Stems / Q000737:chemistry*; D012015:Reference Standards; D013237:Stereoisomerism; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D014315:Triterpenes